A targeting vector was constructed such that a Foxp3 cDNA lacking exons 2 and 7 was inserted at the translation initiation ATG codon of Foxp3 and the TGA stop of Foxp3 was replaced by a 2A peptide-GFP cassette followed by a double polyadenylation signal (pA) and an FRT-flanked neomycin cassette. The neomycin cassette was removed via flp-mediated recombination. (J:338777)